Answer:
175
Step-by-step explanation:
To find the surface area of the pyramid you have to find the area of each side.
1. Find the area of one of the triangles, 0.5 * 7 * 9 = 31.5.
2. Then, multiply the answer times 4 since you have 4 identical triangles, 31.5 * 4 = 126.
3. Now, find the area of the of the square, 7 * 7 = 49.
4. Lastly, add the area's together, 126 + 49 = 175.
